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Either amplifiers/diversifiers are part of a rear antenna (those boxes on it) or it's integrated into CIC itself or even both. Not much difference having it somewhere in between vs having it in CIC directly.

Given the antenna thing itself is called "Aerial amplifier Digital Audio Broadcasting" in WDS, most probably it's internal to the antenna thing.

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P.S. In ISTA you need to search by text for wiring diagrams (if not displayed by diagnosis procedure). The one you need should be called "Radio reception". Depending on ISTA version you may need to have car identified by connecting to it to find diagrams. But then you must have DAB receiver already added to FA, etc. WDS is MUCH simpler (and faster) for car models it has diagrams for! But it needs XP or earlier (AFAIR). I use it on virtual machine.